Photo of the Day is chosen from various OP galleries, including Assignments, Galleries and the OP Contests. Assignments have weekly winners that are featured on the OP website homepage, Facebook, Twitter and Instagram. To get your photos in the running, all you have to do is submit them.

When it comes to selecting lenses for wildlife photography, the first thing most photographers look for is focal length—a long lens that can reach out and cover great distances, bringing animals in for close-ups—but other features are also incredibly useful.